The bismuth orthotantalate with high anisotropic thermal expansion

The triclinic phase of the bismuth orthotantalate (β-BiTaO4) exhibited strong anisotropy of thermal expansion in the temperature range of 25–750 °C. The character of the thermal expansion of β-BiTaO4 changed radically near 200 °C, which was not observed in its isomorphic analog (β-BiNbO4). In the sa...

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Bibliographic Details
Published in:Scripta materialia 2019-12, Vol.173, p.6-10
Main Authors: Zhuk, N.A., Krzhizhanovskaya, M.G., Belyy, V.A., Sekushin, N.A., Chichineva, A.I.
Format: Article
Language:English
Subjects:
Differential scanning calorimetry (DSC)
Phase transformations
Thermal expansion
X-ray diffraction (XRD)
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Summary:The triclinic phase of the bismuth orthotantalate (β-BiTaO4) exhibited strong anisotropy of thermal expansion in the temperature range of 25–750 °C. The character of the thermal expansion of β-BiTaO4 changed radically near 200 °C, which was not observed in its isomorphic analog (β-BiNbO4). In the same temperature range the electrical properties also exhibited the local extremum. Crystal structure of β-BiNbO4 was refined at 25, 200, 400 and 600 °C from powder X-ray diffraction data. The role of bismuth lone-electron pair is discussed. β-BiTaO4 has a potential to be used as a thermal expansion material. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.07.039